FUNCTIONS OF SWIMBLADDER OF FISHES. 115 



the gland which may aid in the secretion of gases into the swim- 

 bladder. The apparent secretion of oxygen is believed to be 

 brought about by (a) an increased flow of blood because of the 

 dilatation of the capillaries and (b) an increased tension of the 

 oxygen due to the local dissociation of oxygen from oxy-hemoglo- 

 bin. 



ii. The swimbladder is a mechanism which enables the fish 

 to actively maintain its stability in the midst of changing external 



conditions. 



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